Two constants determine the isotropic constitutive law, for example E and ν or the two Lamé constants. Other elastic moduli follow from relations such as $G=E/[2(1+\nu)]$. Therefore the number is 2.
More Strength of materials: stress and strain, stress-strain curves, trusses, bars, beams and shafts, determinate and indeterminate questions
GATE 2019 AE Q33– A thin isotropic plate has E=210 GPa, Poisson ratio 0.3, initial x dimension 100 mm and y…
GATE 2019 AE Q40– A simply supported beam PR of length 1 m has a downward force 200 N and counterclockwise…
GATE 2019 AE Q59– A rigid uniform slab hangs symmetrically from three vertical cables of identical length…
GATE 2019 AE Q60– The pin-jointed right-isosceles truss shown has a 10 cm base. Each member has E=200 GPa…
GATE 2019 AE Q61– A solid circular shaft has factor of safety 2 under a given torque. A concentric hole of…
GATE 2024 AE Q53– In the figure shown below, the magnitude of internal force in member BC is N (rounded off…